2
Power
Teseo-LIV4F is supplied by two power pins:
•
VCC (pin 8)
VCC is the main supply: its range can be from 1.8 V to 3.3 V.
A startup or during low power application current can change suddenly. It is important to use power device
able to provide this current variation. Use LDO above 200 mA current.
•
VBAT (pin 6)
VBAT is the supply for the low power domain backup: RAM and RTC. Its range can be from 1.8 V to 3.3 V.
It can be either connected to VCC or it can be supply by a dedicated supply always ON. VBAT supply can be
kept ON during low power mode to allow fast recovery of GNSS fix.
If no backup supply is available, leave VBAT pin floating.
2.1
VCC_RF (pin 14)
VCC_RF is an output supply for external active antenna. The current is limited below 35 mA.
2.2
Power supply design reference
For first PCB, it is recommended to plan to have some filtering components on Teseo-LIV4F power supplies as
follows:
Figure 2.
Power supply filtering
Note:
Decoupling capacitor must be placed close to module pin.
UM3004
Power
UM3004
-
Rev 1
page 3/17
